tailieunhanh - Frontiers in Robotics, Automation and Control Part 12

Tham khảo tài liệu 'frontiers in robotics, automation and control part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | A semantic Inference Method of Unknown Words using Thesaurus based on an Association Mechanism 323 degree of matching it is possible to consider the Degree of Association even for Primary Attributes that do not match perfectly. When the correspondences are thus determined the Degree of Association R A B between Concepts A and B is as follows L R A B p I ai bxi ui vxi X min u vxi max i vxi 2 7 In other words the Degree of Association is proportional to the Degree of Identity of the corresponding Primary Attributes the average of the weights of those attributes and the weight ratios. 4. Unknown Word Registration Experiment The Thesaurus used in This Experiment A thesaurus is a dictionary where words are semantically classified and generally indicated with a tree structure. The thesaurus has two types 1 a classification thesaurus with words only on leaf nodes and 2 a hierarchical thesaurus with words on root nodes and intermediate nodes besides leaf nodes. In this paper a hierarchical NTT thesaurus NTT 1997 was used for the experiment of the unknown word registration. Figure 2 shows a part of NTT thesaurus. Fig. 2. An example of NTT thesaurus used in this paper 324 Frontiers in Robotics Automation and Control Method of Experiment 1000 words were extracted as unknown words from the words registered in NTT thesaurus explained in section . Two-stage sampling method was used as the extraction method. On the first stage an equal probability sampling was carried out on the nodes with ten or more registered words. Then on the second stage an equal probability sampling of nonrestoration was carried out on noun words at the nodes. Examples of the words extracted as unknown words are shown in table 1. Registered node Unknown word Remove Diversion Inversion Opposition Rejection Declination Union Bridal Price Advance Woman Girl Dropping Drip Superior Seniority Detainment Captivity City Suburb Table 1. Examples of unknown words Evaluation We evaluated each technique

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